[Python-Dev] enum discussion: can someone please summarize open issues?

[Antoine Pitrou]

On Sat, 4 May 2013 16:42:08 +1000
Nick Coghlan <ncoghlan at gmail.com> wrote:
> On Sat, May 4, 2013 at 4:10 PM, Georg Brandl <g.brandl at gmx.net> wrote:
> > Am 04.05.2013 01:22, schrieb Antoine Pitrou:
> >> On Sat, 04 May 2013 11:15:17 +1200
> >> Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> >>> Eli Bendersky wrote:
> >>> > I'm just curious what it is about enums that sets everyone on a "let's
> >>> > make things safer" path. Python is about duck typing, it's absolutely
> >>> > "unsafe" in the static typing sense, in the most fundamental ways
> >>> > imaginable.
> >>>
> >>> This isn't about catching bugs in the program, it's
> >>> about validating user input. That's a common enough
> >>> task that it deserves to have a convenient way to
> >>> do it correctly.
> >>
> >> +1. An enum is basically a bidirectional mapping between some raw
> >> values and some "nice" instances, so it deserves a well-defined lookup
> >> operation in each direction.
> 
> As I see it, there are 3 possible ways forward here:

4. Offer classmethods named Enum.by_name() and Enum.by_value().
Simple and explicit.

Regards

Antoine.